> It does the same with all the option values.
> In this case, the code tries to fool robots, but a 
> redirection on error is common and errors are common too.
> Would it be possible to find incoherence in option values 
> or catch the error code (and redirection in .htaccess ?) 
> and avoid many useless files in case of .htaccess 
> redirections?
HTTrack can not read the remote .htaccess (read 
protected) ; and can not easily guess that jpg files will 
be in fact in another directory.. 

You can disable the "attempt to detect all links" option, 
which will not generate these errors anymore